"Look, we're in a very powerful position in that 90-plus million people have read the book, so if like a third of the … if hundreds of those people, that's successful, if they see the film, so it's a nice position to be in, but I have no idea what it's going to do," Dornan said.

But filming Fifty Shades did help the star change the way he walks.

Dornan explained that he used to walk on his tip-toes, leading to comments from others and giving him a bit of a complex about it.

For Fifty Shades, he had to learn how to dance, after telling filmmakers that he knew how to dance when he couldn't.

"So I had dance lessons. We did the fox-trot, and I was really struggling with it, and the dance teacher said, 'You know what you need to do? Just think about it as walking,' " Dornan explained, making a face to indicate that that wasn't the most helpful advice. "It's funny; I'm not great at walking. He said, 'Just think, walking heel-to-toe, heel-to-toe.' And I was like, 'Heel-to-toe?' And no one ever told me that. I thought it went toe to like more toe."

The Fifty Shades star stopped short of debuting his new way of getting around, but audiences will likely see that, as well as his dance skills (and probably a lot more), in the Universal/Focus release of Fifty Shades, which is set to hit theaters on Valentine's Day 2015.